How long does a gallon last you? For me a day. Today half way to work I filled up an empty tank. Holds one gallon exactly. Used it a little the rest of the way. One the way home I actually went out of town. Roads were bad. When I got home the low fluid level was already on. I did have my lights on, so all nozzles were operating.

Just seems like its using too much. If I do not use the system, it stays at level for days. So its not a leak issue. Seems like the headlight wipers are using twice as much as the windshield wipers.

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car